chứng minh 3-4cos2x+cos4x/ 3+4 cos2x+cos4x = tan^4x
Answers
Answered by
2
Answer:
You have also been given the hint
cos
4
(
x
)
=
(
1
2
[
1
+
cos
(
2
x
)
]
)
2
Replacing the term
cos
4
(
x
)
with the hint gives
Similar questions